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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '799914aae0e343bcf9797e9b51cf56b3904ac6207782dff3c5e1df42cd246476' 
  AND token = 'jftbJQVPGwCVATf9r0y8xnKt3lqAVJ1yXA9d2hkOahU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}